I just looked at the audioasylum chart and it is wrong
wrong wrong. How do I know? I did a test of 12 of these
meters. 6 analog 6 digital. Using LEAP and Melissa to calibrate. First, the analog meters were more accurate
and consistent, although they varied by 1-2 db. As far
as the low freq. it is quite accurate down to 30hz but
reads low at 25 and 20. It is also very accurate from
200-2k. Above 2k is where it goes astray and where the
audioasylum chart is way way off. You absolutely do not
want to add to these readings as they are already too
high. Here is a list of the average of the six analog
meters corections from 2khz. You SUBTRACT these from
the meter reading. 2k -1db, 2.5k -4db, 3.15k -4db,
4k -4db, 5k -5db, 6.3k -5db, 8k -4db, 10k -3db, 12.5k 0db.
you ADD to the next two. 16k +2db, 20k +5db. If you use
these corrections you can get a surprisingly accurate
in room speaker response curve.
wrong wrong. How do I know? I did a test of 12 of these
meters. 6 analog 6 digital. Using LEAP and Melissa to calibrate. First, the analog meters were more accurate
and consistent, although they varied by 1-2 db. As far
as the low freq. it is quite accurate down to 30hz but
reads low at 25 and 20. It is also very accurate from
200-2k. Above 2k is where it goes astray and where the
audioasylum chart is way way off. You absolutely do not
want to add to these readings as they are already too
high. Here is a list of the average of the six analog
meters corections from 2khz. You SUBTRACT these from
the meter reading. 2k -1db, 2.5k -4db, 3.15k -4db,
4k -4db, 5k -5db, 6.3k -5db, 8k -4db, 10k -3db, 12.5k 0db.
you ADD to the next two. 16k +2db, 20k +5db. If you use
these corrections you can get a surprisingly accurate
in room speaker response curve.